These cities have flags or are likely to have flags.
The following cities have reported they are flagless:
Adair Village, Adams, Antelope, Ashland, Astoria, Aumsville, Aurora, Bandon, Bay City, Beaverton, Bend, Brownsville, Burns, Canby, Canyonville, Carlton, Central Point, Coburg, Columbia City, Cornelius, Creswell, Culver, Dallas, Depoe Bay, Dundee, Dunes City, Durham, Enterprise, Estacada, Fairview, Forest Grove, Gearhart, Gervais, Gold Beach, Gold Hill, Grants Pass, Happy Valley, Harrisburg, Hillsboro, Independence, Junction City, Klamath Falls, McMinnville, Medford, Molalla, Monmouth, Ontario, Pendelton, Sandy, Sherwood, Silverton, Springfield, Stayton, Sutherlin, Sweet Home, Tigard, Tualatin, Wilsonville, and Woodburn.
Whether or not these cities have flags is not known:
Baker City, Canyon City, Condon, The Dalles, Fossil, Heppner, Hermiston, Hood River,
Lakeview, Lebanon, Madras, Moro, Newport, Prineville, Redmond, Roseburg, Tillamook, and Vale.
Oregon Flag Registry 
How does one go about presenting a flag for a city that is on the unknown list or no flag?
Rebecca, Thank you for your interest. Just email us at info@oregonflagregistry.org; do you know of a flag we don’t know about, or would like to propose a flag to a city? Either way, we’d love to talk.